Im usin the titanium xxl its 15mm around, appears to handle 1g easily, but i load up once and it last almost all day for me (i rip all day) flavor is tasty, be advised since you can loadmore it will appear that you have concentrate left but you're getting no results. This is reclaim oil lect in the corners. I know cause after 3 consecutive 30w 15 second back to bacl burn offs it still remained. Gonna order quartz next. All being said, i think youll be satisfied. FYI the XXL is too large for the source XL attachment if thats what youre using. Also of course i reccomend using a temp controlled mod box. Best regards (please excuse the typos, im typing in a starbucks drive thru line from hell)